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9961 (1991 XK)
Classification: Main-belt Asteroid          SPK-ID: 2009961
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1054004005389176 7.1262e-08  
a 2.240789607529892 1.3831e-08 AU
q 2.004609485372797 1.5451e-07 AU
i 4.856188618896806 7.0918e-06 deg
node 239.9797909574226 6.8647e-05 deg
peri 290.7918210045408 7.6816e-05 deg
M 218.3145773887142 3.7449e-05 deg
tp 2457482.695017409822
(2016-Apr-04.19501741)
0.00013001 JED
period 1225.180424832984
3.35
1.1344e-05
3.106e-08
d
yr
n .2938342734696198 2.7205e-09 deg/d
Q 2.476969729686986 1.5289e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      975  
   data-arc span      14103 days (38.61 yr)  
   first obs. used      1976-05-02  
   last obs. used      2014-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52767  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 00:32:00  

Additional Information
 Earth MOID = 1.01689 AU 
 T_jup = 3.623 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO319209  

9961 (1991 XK)          Discovered 1991-Dec-04 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 19990202/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 XK = 1976 JT = 1989 BP 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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